Nerve impulse, Biology

Assignment Help:

NERVE IMPULSE (IT'S GENERATION) -

  1. It is an electro chemical phenomenon manifested through ionic movement across cell membrane.
  2. It was discovered by A. L. Hodykin & A. F. Huxley (1939).
  3. Impulse is a change in resting membrane potential of the cell towards positive side, also called as action potential or spike potential.
  4. All cells bear positive charge outside (due to Na+) and negativity inside thus membrane remain in polarised state.
  5. This potential across the membrane can be measured by putting electrodes inside & outside connected to a galvanometer or potentiometer or a voltameter.
  6. When the cell is at normal resting state, the potential in animal cell ranges from - 60 mv to - 90 mv, this is called resting potential (nerve cell has about - 70 mv)
  7. Any ext. stimulus reaching the membrane causes change in its permeability and Na+ starts rushing inside which results in the rise of potential towards positive side. This process of charge in potential (action potential) is called as depolarisation.
  8. To bring the condition back to normal in nerve cell it is followed by exit of K+  out of the cell which results in resumption of the resting potential known as repolarisation.
  9. Since the rate of exit of K+ is very slow while rate of entry of Na+ is very fast, this result in rise & stay of action potential for some time.

Related Discussions:- Nerve impulse

Our healthi diet, in what form is most carbohydrates is taken in normal die...

in what form is most carbohydrates is taken in normal diet

State about the halsted reitan battery, State about the Halsted Reitan batt...

State about the Halsted Reitan battery The Halsted Reitan battery, as the procedure came to be known over the years, also has a history. It has been described as a fixed batter

Determine the uses of iron - soil, Determine the uses of Iron - Soil Ir...

Determine the uses of Iron - Soil Iron is a constituent of cytochromes, haem and non-haem enzymes. It is also essential for chlorophyll formation though is not a part of it. It

Phylum protozoa, PHYLUM  PROTOZOA Definition  and  Introduction  ...

PHYLUM  PROTOZOA Definition  and  Introduction  All  unicellular ( or  acellular )  eukaryotic  animals. Most  primitive (Gr. Protos = first=zoon= animals ) organisms

Class of crustacea - cirripedia, Class of Crustacea - Cirripedia These...

Class of Crustacea - Cirripedia These crustaceans are completely marine, and include the barnacles. Moa species are free living, attached to rock, and other objects. Some are

What are persistent organic pollutants, What are persistent organic polluta...

What are persistent organic pollutants (POPs)? POPs, or persistent organic pollutants, are toxic substances formed from organic compounds. POPs are made in several industrial p

Amelioration of mineral deficiency, Amelioration of mineral deficiency ...

Amelioration of mineral deficiency Performance of livestock in the tropics is mainly governed by the quality and quantity of nutrients provided in the diet. In most of the dev

Types of polysaccharides on the basis of functionality, FUNCTIONAL L Y PO...

FUNCTIONAL L Y POLYSACCHARIDES ARE OF THREE TYPES - Storage, Structural, Mucopolysaccharides Storag e polysaccharides function as reserve food which can be hydrolyzed

Inter-relationships of classification, Inter-relationships of Classificatio...

Inter-relationships of Classification The aim of classification is to put together organisms on the basis of their similarities. But the question is what type of similarities?

Tubercular meningitis , Tubercular Meningitis (TBM) Tubercular meningi...

Tubercular Meningitis (TBM) Tubercular meningitis is a serious complication of childhood tuberculosis. It usually occurs secondarily to primary infection with tuburculosi

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd